Sanborn fire insurance maps
The Sanborn Map Company mapped American towns block by block for fire insurers from 1867: each building's outline, what it was built of, its floors and use. They are the best record of what stood on a street in a given year. Each result here is a volume, with its sheets listed on its page.
Why they are free to use: Sanborn maps published before 1931 are out of copyright in the US. Each map's page shows its own licence basis and a credit line.
Cities
Search “Sanborn fire insurance map of a large city” for more, or ask Claude for it

Sanborn Fire Insurance Map from Detroit, Wayne County, Michigan, 1897, volume 5
1897 · 40 sheets

Sanborn Fire Insurance Map from Detroit, Wayne County, Michigan, 1897, volume 8
1897 · 40 sheets

Sanborn Fire Insurance Map from Buffalo, Erie County, New York, 1889
1889 · 40 sheets

Sanborn Fire Insurance Map from Saginaw, Saginaw County, Michigan, 1901, volume 2
1901 · 40 sheets

Sanborn Fire Insurance Map from Detroit, Wayne County, Michigan, 1897, volume 6
1897 · 40 sheets

Sanborn Fire Insurance Map from Buffalo, Erie County, New York, 1899, volume 5
1899 · 40 sheets

Sanborn Fire Insurance Map from Saginaw, Saginaw County, Michigan, 1901, volume 3
1901 · 40 sheets

Sanborn Fire Insurance Map from Buffalo, Erie County, New York, 1899, volume 6
1899 · 40 sheets
Small towns
Search “Sanborn fire insurance map of a small town” for more, or ask Claude for it

Sanborn Fire Insurance Map from Farmington, Fulton County, Illinois, 1899, volume 2
1899 · 3 sheets

Sanborn Fire Insurance Map from Sac City, Sac County, Iowa, 1899, volume 2
1899 · 2 sheets

Sanborn Fire Insurance Map from Sac City, Sac County, Iowa, 1909, volume 3
1909 · 3 sheets

Sanborn Fire Insurance Map from McConnellsburgh, Fulton County, Pennsylvania, 1899, volume 3
1899 · 3 sheets

Sanborn Fire Insurance Map from Midland, Midland County, Michigan, 1899, volume 4
1899 · 8 sheets

Sanborn Fire Insurance Map from Macomb, Mcdonough County, Illinois, 1906, volume 4
1906 · 8 sheets

Sanborn Fire Insurance Map from Sidney, Delaware County, New York, 1891
1891 · 5 sheets

Sanborn Fire Insurance Map from Oquawka, Henderson County, Illinois, 1899, volume 3
1899 · 4 sheets
The 1880s
Search “Sanborn fire insurance map 1880s” for more, or ask Claude for it

Sanborn Fire Insurance Map from Red Jacket, Houghton County, Michigan, 1884
1884 · 9 sheets

Sanborn Fire Insurance Map from San Diego, San Diego County, California, 1887
1887 · 18 sheets

Sanborn Fire Insurance Map from Grand Rapids, Kent County, Michigan, 1888
1888 · 40 sheets

Sanborn Fire Insurance Map from Houghton, Houghton County, Michigan, 1888
1888 · 13 sheets

Sanborn Fire Insurance Map from San Jose, Santa Clara County, California, 1884
1884 · 40 sheets

Sanborn Fire Insurance Map from Fort Scott, Bourbon County, Kansas, 1884
1884 · 8 sheets

Sanborn Fire Insurance Map from Haverhill, Essex County, Massachusetts, 1886
1886 · 23 sheets

Sanborn Fire Insurance Map from San Antonio, Bexar County, Texas, 1888, volume 2
1888 · 16 sheets
The 1900s
Search “Sanborn fire insurance map 1900s” for more, or ask Claude for it

Sanborn Fire Insurance Map from Saint Clair, Saint Clair County, Michigan, 1900, volume 3
1900 · 5 sheets

Sanborn Fire Insurance Map from Houghton, Houghton County, Michigan, 1900, volume 3
1900 · 28 sheets

Sanborn Fire Insurance Map from Rochester, Oakland County, Michigan, 1900, volume 3
1900 · 3 sheets

Sanborn Fire Insurance Map from Marine City, Saint Clair County, Michigan, 1900, volume 3
1900 · 8 sheets

Sanborn Fire Insurance Map from Farmington, Fulton County, Illinois, 1909, volume 3
1909 · 4 sheets

Sanborn Fire Insurance Map from Chicago, Cook County, Illinois, 1901, volume 14
1901 · 40 sheets

Sanborn Fire Insurance Map from Buchanan, Berrien County, Michigan, 1900, volume 4
1900 · 4 sheets

Sanborn Fire Insurance Map from Florence, Fremont County, Colorado, 1900, volume 3
1900 · 4 sheets
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